If the endothelial cells of the blood vessels in the body did not possess adhesion molecules, which of the following would occur?

• A. The immune cells which respond to infection or injury would not be able to leave the blood stream.
• B. The immune cells would not be able to detect where the infection is in the body.
• C. The immune cells would not be able to phagocytose the infecting microbes and damaged tissue.
• D. The blood vessels would adhere to the immune cells allowing them entry to infected regions of the body.